Your message does not relate itself to any conversation that was going on, thus it may not have reached the intended people.
Go back to the message you read and look at the bottom of the message box you will see an rounded arrow. Run your cursor over that and it should say to "Reply". If you will click on that you should be able to respond directly to the people involved in what you are talking.
Anyone else out there reading this reply if I have advised incorrectly.